Carl, S., & Heikkilä, S. (2010). Fixed point theory in ordered sets and applications: From differential and integral equations to game theory. Springer New York. https://doi.org/10.1007/978-1-4419-7585-0

Carl, S., and Seppo Heikkilä. Fixed Point Theory in Ordered Sets and Applications: From Differential and Integral Equations to Game Theory. New York, New York: Springer New York, 2010. https://doi.org/10.1007/978-1-4419-7585-0.

Carl, S., and Seppo Heikkilä. Fixed Point Theory in Ordered Sets and Applications: From Differential and Integral Equations to Game Theory. Springer New York, 2010. https://doi.org/10.1007/978-1-4419-7585-0.